Yuezhi

The Yuezhi were an ancient tribe of barbarians from the Xinjiang and Gansu regions of western China, with 400,000 Yuezhi living in China at the time of the early Han dynasty. The Yuezhi inhabited the arid plains of western China before the 2nd century BC, but their king was slain by Modu Chanyu's son Laoshang Chanyu in 177 BC, and the Yuezhi were forced into an exodus to Central Asia. Some Yuezhi fled to the border with Kazakhstan, while others fled to the Tarim Basin.